At 08:04 PM 4/18/2002, Mark Oberle wrote:
>Although it might make sense, I could only find a few papers arguing that
>at low densities, such as at the edge of their range, species might tend
>to vocalize less than at higher population densities, with a lot of singin=
g
>rivals nearby. Does anyone have any similar or counter impressions?
My observation is that most Passerines are stimulated to sing by other
birds singing near them. Not just by their own species, either . In fact
they are often stimulated to sing by almost any other sound - which is why=
so many good recordings are made just as airplanes fly by!
Doug
Doug Von Gausig
Clarkdale, Arizona, USA
Moderator
Nature Recordists e-mail group
http://groups.yahoo.com/group/naturerecordists
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